Lorentz invariance relations for twist-3 functions and frame-independence of twist-3 cross sections

Apr 12, 2016, 4:30 PM
SR4a (DESY Hamburg)


DESY Hamburg

Spin Physics WG6 Spin Physics


Prof. Yuji Koike (Department of Physics, Niigata University)


We derive a complete set of relations among twist-3 distribution and fragmentation functions based on the QCD equation-of-motion and identities among nonlocal operators which fully incorporate the constraints from Lorentz invariance. We show that the dynamical twist-3 functions constitute a complete set of twist-3 functions and other types of twist-3 functions can be expressed in terms of the dynamical ones and the twist-2 functions. We also show that those relations guarantee the frame-independence of the twist-3 observables.

Primary author

Prof. Yuji Koike (Department of Physics, Niigata University)


Prof. Andreas Metz (Temple University) Dr Daniel Pitonyak (RIKEN BNL Research Center) Dr Koichi Kanazawa (Temple University) Dr Marc Schlegel (University of Tuebingen)

Presentation materials